Explanation

The percentage yield is the most common measure of efficiency in chemical reactions, comparing actual yield to theoretical yield.

Explanation

Vacuum distillation is used to distill substances at lower temperatures by reducing the pressure, which lowers the boiling point of the substances.

Explanation

Meticulous means محتاط

Conscientious means باضمیر

Precise means عین مطابق

Explanation

The error in the sentence regarding word order is in the phrase "prepared, delicious and it served a meal."

The word "delicious" is incorrectly positioned with the comma, leading to confusion in the sentence structure.

A corrected version could be: "The chef quickly prepared a delicious meal and served it."

This revision maintains proper word order and clarity.

Explanation

The correct version should be: "She enjoys reading, writing, and painting."

The gerund form ("painting") should be used to maintain a parallel structure with "reading" and "writing."

Explanation

The preposition "on" is commonly used to indicate involvement or engagement with a specific task, project, or activity.

Explanation

The complete sentence would be: "Do you usually take a bus to the market?"

The preposition "to" indicates direction or a destination.

In this case, it shows that the market is the destination you are traveling to.

Explanation

The correctly punctuated sentence is:

a. Let's meet at Sarah's house after school.

This option correctly uses the contraction "Let's" and the possessive form "Sarah's."

Explanation

The correctly punctuated sentence is:

b. The teacher asked, "Did you complete your homework?"

This option uses proper quotation marks and capitalization for the direct question.

Explanation

The complete sentence would be: "After she had climbed the stairs, her heart almost gave out from exhaustion."

This uses the past perfect tense,

Indicating that the action of climbing the stairs was completed before the subsequent action (her heart almost giving out)